[rhythmbox] missing-plugins: fix crash after successful installation

[Jonathan Matthew <jmatthew src gnome org>]

commit f9502f5cfdcc8612383a4c65c8737cd8025c8bd5
Author: Jonathan Matthew <jonathan d14n org>
Date:   Sun Nov 21 16:16:41 2010 +1000

    missing-plugins: fix crash after successful installation

 sources/rb-import-errors-source.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/sources/rb-import-errors-source.c b/sources/rb-import-errors-source.c
index 0a442cd..2ec7c4b 100644
--- a/sources/rb-import-errors-source.c
+++ b/sources/rb-import-errors-source.c
@@ -434,8 +434,11 @@ missing_plugins_retry_cb (gpointer instance, gboolean installed, RBImportErrorsS
 		return;
 	}
 
-	g_object_get (source, "entry-type", &error_entry_type, NULL);
+	if (gtk_tree_model_get_iter_first (GTK_TREE_MODEL (source->priv->missing_plugin_model), &iter) == FALSE) {
+		return;
+	}
 
+	g_object_get (source, "entry-type", &error_entry_type, NULL);
 	do {
 		RhythmDBEntry *entry;